Welcome to ThisIsMS. I believe that you will find a supportive community here. A diagnosis of MS is one of exclusion. There are several diseases which can cause symptoms which look like MS. A couple of these include vitamin B12 deficiency and Lyme disease. There are others as well. A neurologist must exclude these other diseases as a possibility before declaring an MS diagnosis. Make sure that your having the appropriate tests done. Several of the other conditions which mimic MS are actually treatable.
By the way, when you get the spinal tap done your doctor should advise you to lie down for a while afterwards. Do this. It's in your best interest. It will help prevent/minimize the post tap headache. Calling it a "headache" is a euphamism. For me, it felt like someone was trying to pull my brains out of my head down the back of my neck. Needle bevel orientation during the tap is also important.general-discussion-f1/topic20631.html#p196861